Putting a couple of ounces of weights such as gravel, tire weights, or even sinkers inside a 2-liter jug will make it harder for the wind to blow it around; most important, when you get a hit that's hard enough to tip the jug up, the weights slide down into the neck and keep the jug in a tipped position, letting you know you need to check that jug.
For foam noodlers, if you get the type that has a hole down the center, you can slide a piece of pvc pipe through the noodle. Leave an inch or two sticking out one end, and a foot or so sticking out the other. Insert your weights inside the pipe and cap both ends. Attach your line to the long end of the pipe. Again, when you get a good hit, the weights slide down and keep the jug in a tipped position.